Prusa extruder and MK8 gear

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Macca
Posts: 4
Joined: Wed Jul 19, 2017 10:23 am

Prusa extruder and MK8 gear

Post by Macca » Wed Jul 19, 2017 2:11 pm

What have you guys done about fitting the larger mk8 gear to the prusa extruder?

Just printed my extruder and saw per toms video it doesn't fit. I drilled the holes for the motor mounts out to 4mm to get it better, cant go much bigger.

Has anyone re designed it with the feed holes aligning with a mk8 gear, or gone different designs?

slippyr4
Posts: 224
Joined: Thu Jun 15, 2017 10:24 am

Re: Prusa extruder and MK8 gear

Post by slippyr4 » Wed Jul 19, 2017 2:30 pm

I'm using an e3d hobgoblin drive gear on mine. It's a much better diameter and works ok without any mods.
Self-built Prusa i3 MK2 clone
My things: https://www.thingiverse.com/slippyr4/designs
My Prusa firmware port for ramps & MKS : https://github.com/slippyr4/Prusa-Firmware

Stefan
Posts: 223
Joined: Thu Jun 15, 2017 12:46 am

Re: Prusa extruder and MK8 gear

Post by Stefan » Wed Jul 19, 2017 9:44 pm

Might give this a try:

https://www.thingiverse.com/thing:2261050

I've seen at least one other on thingiverse that I tried out and it fixed the problem for the mk8 gear.

Peter Bermingham
Posts: 13
Joined: Thu Jul 06, 2017 6:00 pm
Location: Warracknabeal Victoria Australia
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Re: Prusa extruder and MK8 gear

Post by Peter Bermingham » Sat Aug 05, 2017 2:33 pm

I'm With slippyr4 I've ordered a e3d hobgoblin drive gear I think its easier than reprinting the extruder housing

slippyr4
Posts: 224
Joined: Thu Jun 15, 2017 10:24 am

Re: Prusa extruder and MK8 gear

Post by slippyr4 » Sun Aug 06, 2017 10:27 am

IMG_3244.jpg
IMG_3244.jpg (116.67 KiB) Viewed 2260 times
So this is a standard MK2S extruder body with the e3d hobbgoblin. as you can see, the filament path is almost straight and it's working fine for me. PLA, ABS, PETG and FormFutura EasyWood all printed fine so far.
Self-built Prusa i3 MK2 clone
My things: https://www.thingiverse.com/slippyr4/designs
My Prusa firmware port for ramps & MKS : https://github.com/slippyr4/Prusa-Firmware

Macca
Posts: 4
Joined: Wed Jul 19, 2017 10:23 am

Re: Prusa extruder and MK8 gear

Post by Macca » Mon Aug 07, 2017 1:15 am

So after realizing I miss ordered my belt drive gears and had t2.5 drive gears I hit up banggood for some new drive gears and also found some 8mm extruder drive gears.

https://www.banggood.com/2Pcs-Reprap-Me ... ds=myorder

cheap, well made and a little smaller than the MK8 drive gear, just under 1mm smaller, seem to work better with the drilling of holes and this gear.

you just need to fit the gear to the motor before you bolt the motor on, ill grab a pic soon

Macca
Posts: 4
Joined: Wed Jul 19, 2017 10:23 am

Re: Prusa extruder and MK8 gear

Post by Macca » Tue Aug 08, 2017 5:53 am

Pics of extruder hobbed gear
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IMG_6759.JPG
IMG_6759.JPG (1.67 MiB) Viewed 2238 times
IMG_6758.JPG
IMG_6758.JPG (2.12 MiB) Viewed 2238 times

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