Silent extruder gears (Rapman)

by chylld, published

Silent extruder gears (Rapman) by chylld Nov 1, 2010


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The standard acrylic involute gears were driving me nuts with their incessant CLICK-CLACK CLICK-CLACK noises, so I designed these herringbone gears to replace them. Now I can't hear my printer from the next room :)

The motor gear has a 'floor' to help you position the grub/nut easily and precisely. The rebate for the nut has also been set back from the shaft a bit to make it easier to fit than ever.

An additional advantage is that they are constantly in mesh, so there is no slack to take up when reversing direction (if you use M227, this happens hundreds/thousands of times each print!) so you will have cleaner prints too.


Print using your favourite settings (no support material required) however do NOT print with PLA as the extruder motor heat will soften the drive gear and the grub nut will come loose.

When installing, replace the split-ring washer on the extruder drive shaft with a new M8 flat washer, and place the split-ring between the original washer and nut. This keeps everything from coming loose without letting the split-ring tilt the driven gear.

Lastly, face the grub slot up for aesthetics - not only will it hide the slot, but from the front of the machine the driven gear will look like arrows pointing and moving towards the filament.

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its very quite for me and no wear

Huge thanks for this realy useful set, this is the most important improvements for RapMan owners.

Good parts, I'd like to mention it is important to align the 2 gears carefully...

Thanks for this great part! After the original extruder gear broke immediately, I printed your version and it works since 10 hours of printing very smooth.

I have an indiscreet question: Could you please tell me, what software you use to design your parts? I am very much interested in creating my own objects but so far I could not find a suitable software to design technical objects in 3D. Thanks in advance for your hints.

I use Maya to design all my parts. I do not recommend it :)

Thanks for answering.

Maya is definately too expensive for me :(

I use actually sketchup 8. Perhaps it fulfills my needs with more skill.

Hi, thanks for your work on the Rapman!! I printed your gears. I did put both in the same STL file and ran it as generated by Axon 1 with .70 fill. (same as I used for the Z drive sprocket). I did need to use a raft with my ABS.

These work really well. Much quieter.

Great job , i have also printed your z gear for the rapman 3.1. The original one was broken, your design is much stronger than the original one. Thank you very much, without your z gear i was not able to print anymore.

Are these supposed to be the same outside diameter?

Sorry for the late reply - no they are of different diameter and also have different numbers of teeth (14 v 17)

Does this change the gear ratio?

The gears maintain the same gear ratio :) My previous message was misleading - each gear has the same outside diameter as the respective old gear it replaces - but of the two gears presented here, one is larger than the other (just as with the old gears)

I installed them yesterday and they work perfectly! Thanks!

You're welcome!

Nice design - just printed them and can't wait to break them in.

Awesome... now if only I hadn't glued my drive gear in place. :(

Awesome!! I have been wanting something like this for a while, can't wait to try it out.

Thank you for all the work you put into RapMan upgrade parts!

You're welcome! Just make sure you print it in ABS and not PLA, I was printing your Thing7 overnight and woke up in the morning to find it had stopped extruding half-way through thanks to the PLA gear softening from the extruder motor heat and losing the grub screw :(