RepRap: Blog

It's amazing to see how much the RepRap community has grown in the 6 years since it started, and little over 3 since RepRap 1.0 Darwin was released.  We have gone from only being able to get the parts for a Darwin from commercial prototyping services that made the total build cost $3000+ to today where you can put a Mendel together for $400.  This blog post is going to try to help a person figure out the easy ways to get into this hobby.

There are 2 main ways to get a RepRap or RepRap alike (Or Repstrap).  You can buy a kit or you can self source.  I am a very large fan of self sourcing because the difference between the cheapest kit I can personally recommend and the self sourced machine is $425, or TWICE as much.

Self Source Open Source (The Cheap Skate Route)

A RepRap is made up of 4 categories of parts.  Motors, electronics, RP (Plastic Parts), and Hardware: These parts are not hard to find, and no matter where you are in the world you can have them shipped to you.  Below I will give a bit of a guide on how to find these parts outside of a kit vender.

RP (Plastic Parts)

The availably of plastic parts has seen a real dramatic shift in availably in the last year.  24 months ago there was literally almost NO parts available for less that then commercial Prototyped price ($1300ish),  18 months ago the parts where going for $700ish on Ebay, 6 months ago they settled on an average of $250-$300, and now there is such a glut of parts that they are going for $100 and cast $50.  This is part of the magic of the $400ish RepRap.  I find these to be the best places to find the RP Parts.

Print them yourself:  I know, how do you print the parts for your 1st 3d printer when you don't have a 3d printer?  Well believe it or not there are 3d printers all over the world, and most Metropolitan areas of the world now have at least 1 RepRap or RepStrap operator, if not dozens.  Before you go buy a kit, or buy parts off the internet search your local area to see if someone has a Makerbot, RepRap, or other 3d printer.  You would be amazed at how friendly our community is.  The best places I have found to find Local 3d printer operators are:

The RepRap User Groups:  Even if you don't find anyone in there, post that your trying to get the parts, there is a very good chance that the 3d printing bug has infested someone else in your area.
The RepRap Map:  This will let you know if someone is in your area, most the time people don't put links for people to contact them here, but 90% of the time there is enough info in the link to hunt the person down
The Makerbot Map: Same thing but for Makerbots.  There is a LOT of people who have bought Makerbots,
The Makerbot User Groups:  Makerbot has compiled a nice list local MB user groups.

Buy the RP parts: This is the most common way for people to build their 1st RepRap.  There are plenty of different places on the internet to get the parts.  The most quality dependent part of the print is the gears, so when you buy the parts, insist on a good photo of the gears, you are looking for very well defined teeth on the gear.  Here is where I suggest you get the parts:

RepRap IRC:  Our community's IRC channel is a hopping place.  The reason I say go here 1st is because by buying your parts in this channel your also helping out the people who are most likely going to help you get it running.
Emakershop  Jeanmarc from the IRC runs this webshop.  The great thing about it is that it has a varitey of venders (you can literally self souce JUST out of his shop for $550ish (if everyone is in stock, which they are not now).  Lots of us like this vender because he does not charge a transaction fee.  Only thing you have to pay is Paypal fees.
Ebay This is likely going to be the most expensive way to get the parts, because with Ebay there is no way to get around the doubt hit of Paypal and Ebay fees.  Unless you just have to don't buy parts here.
RepRap Forum Parts go up for sell in the Forum all the time (less than you will find at any of the other choices), but people do sell there.  1 note it is VERY easy for people to "Puppet" in our forums, so you never know if the reviews listed there are real or someone being dishonest.  Most the Ebay sellers also sell here, so buying in the forum allows you to skip the Ebay fee.
Metrix Clonedel These are the cheapest parts, and I have personally reviewed their products, they are good enough replacements for the printed parts.  They do require processing with a drill press.


Electronics:


The electronics are the heart of your machine, and the part of the machine that most effects your overall experience with the machine.  I have experience with RAMPS, Gen6, Gen3, and Gen4.  All have worked well for me.  The big difference between these electronics is the cost / firmware support you get with them.

RAMPS Is currently my favorite electronics.  Mostly because it's both "single board" & modular, has provision for controlling a heated build plate, has the most active development (3 separate teams competing and working together on firmware for it), and it's about the cheapest electronics I can suggest ($140 if you do it yourself $200 if you get it preassembled. It's sold by Ultimachine, or you can etch it yourself.

Gen6 Is my second favorite choice.  It does not have provision for a heated build plate, and it has the least active development team as far as new firmware.  It's not etch-able, and is only available from 1 vender, Mendel-Parts.com.  But is the simplest set of electronics to install, and it does work.  It's $200 with optos.

Gen4 is my 3rd favorite electornics.  This is the official Makerbot electronics, but you could use it on a RepRap.  The up side of Gen4 is that it will out of the box use ReplicatorG, which I think is one of the easiest RepRap control programs, the down side is that Makerbot sells it for $370.  That's twice as much as it costs to put together RAMPS, and 4 times as much as a Sanguinololu.

Gen3 and the multiple derivatives thereof.  There are many companies out there that sell a version of these electronics, but in the end they are 2 years old, and it shows.  Gen3 was problematic, but at the same point LIGHT YEARS ahead of what we had before.  Zach and the guys over at Makerbot did a wonderful job on these, but they are just old now.  If you can pick up a set of these electronics cheap, great, but just remember even at their best they where fussy, and no one is writting firmware for them anymore.  They can be had for as cheap as $165.  The Real Gen3 are no longer sold or supported by Makerbot.

The Self Source options.  If you have the ability to create your own boards, there are some truely cheap and nice options out there for you like Adrian's Ramps, Gen7, Sanguinololu, or even self etched Arduino_Mega_Pololu_Shield.

Electronics can be as cheap as $100ish all the way up to nearly $400 depending on which set you go with.  It's up to you.

Your also going to need a power supply.  If you plan to not run a Heated build plate, you only need 60W for all these electronics.  The power supplies are usually avialable where you buy your electronics, and are either ATX power supplies (Desk top Computer supplies), or Laptop Supplies (Solid state but smaller).

If your going to run a heated build plate your going to need a high amp power supply, so an ATX or Laptop supply is not going to cut it.  You will need something like this:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=120571991063&ssPageName=ADME:X:RTQ:US:1123#ht_3368wt_1139

Just search "12v 20a universal power supply" in ebay and you will see tons on them, just buy the cheapest one.


Motors:


Motors can be the easiest or the hardest parts to source.  All that really matters is that they are NEMA 17 (I know it's "possible" to run a RepRap on Nema 14, but don't even try, it's way more trouble than it's worth) they must be bipolar (4 wire), and have a holding strength of  40 N-cm at an aperage lower than your driver .  Remember if you get 3 amp steppers most of our electronics only push max 2amp, so your not going to get the rated strength, but if you get a 1amp motor (that has the right strength), you can run it on a 2amp driver, just remember not to max the pot on your stepper driver!  When in doubt buy a stronger stepper than you need, because there is no way to make a stepper have more torque than it's rated for.  I use 53.1 N-cm motors just beause the last thing I want to deal with is a skippping extruder steper motor.  Here are some links to motors that look about right, or I have used to give you an idea what you want.


http://www.alltronics.com/cgi-bin/item/N1728D63/55/OSM-NEMA17-Dual-Shaft-Stepper-Motor
http://www.alltronics.com/cgi-bin/item/N1728S56/55/OSM-NEMA17-Single-Shaft-Stepper-Motor
http://ultimachine.com/content/kysan-1124030-nema-17-stepper-motor
http://www.mendel-parts.com/product_info.php?cPath=25&products_id=33
http://www.robotshop.com/soyo-reprap-stepper-motor.html


Any of those would work, but you can buy what ever you want, just remember 1-2amp 40ncm (Good converter if they play games with different numbers), Bipolar, 4 wire.


Hardware:


Hardware will depend on which machine you choose to build.  I have built a Makerbot, Thingomatic, Huxley, 3 Sells Mendels, and well over 5 Prusa Mendels at this point.  You can see videos of all the builds over at my Youtube Channel.  The newest and in most active development RepRap is the Prusa_Mendel.  The advantage of the Prusa is that the hardware costs are a fraction of the Sells Mendel, and it's much easier to calibrate/assemble.  Here is a video showing the two machines side by side.




Assuming you go with the Prusa, you can get most the hardware locally.  The Threaded Rod will be at your local hardware store, the screws you need (SAE if your in the US, Metric anywhere else), will be at the hardware store also (you might have to search in google maps for a thing called a "Fastener Supply" in your area to get the right sizes.  Also your going to need Smooth Rod.  If your self sourcing I am assuming your not rich, so just get "Tool Rod", or "Drill core".  This can be also sourced locally from a machine shop, the Fastener supply, or even from old junk printers, that almost always use 8mm or 5/16 smooth rod.  The only bearing a Prusa uses is the 608 bearing or "Skate board bearing".  Before I started doing support in the RepRap IRC I never knew that every country in the world had Skaters, but they do.  They don't need to be fancy, the cheapest 608 you can find will do (I have even used 2nd hand bearings from the skate shop).


Some Hardware is harder to find locally, such as the belt, you will need .2" or t5 (t5 is the spec belt, but .2" will work)


In the US I have found these suppliers to work great and be cheap: