Spike Control Knob for Monoprice MP Select Mini 3D Printer

by rbnhd, published

Spike Control Knob for Monoprice MP Select Mini 3D Printer by rbnhd Aug 25, 2016
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The stock LCD control knob for the MP Select Mini is terrible, so I created this better control knob as drop-in replacement. This knob is much easier to use and the pattern has maximum grip.

There are various other control knobs for this printer on Thingiverse, however I found some of these did not fit well or were not very grippy. I did a bunch of test prints for various hole sizes and designs to find one which attachedsnugly, but not too tight. I can't guarantee that your prints will be identical, but this one fit great for me.

Pry off the old knob using fishing line, dental floss, or as I did, using a sharp knife to gently rock each side until it came off.

I've also included the 123D Design file for anyone who might want to remix or modify.

Print Settings


Monoprice MP Select Mini






0.1mm or 0.2mm




The spike pattern comes out well on both 0.1mm and 0.2mm resolution, the spikes are slightly sharper and the fit is slightly looser at 0.1mm - print to your preference.

A few makers recommended to position so that the hole is up. I was able to print fine as-is without supports, but you can decide which way you prefer.

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Thank you! I love this 3d Printer but THAT KNOB! So many times it would go to menus I didn' want. Printer in about 30 minutes and fits great.

Jan 29, 2017 - Modified Jan 29, 2017

I made one of these and it doesn't quite fit. It seems to 'wobble' bit, like the center recess isn't deep enough?

I very much like the spikes around the outside, it gives a very grip-able surface.

Sorry it didn't fit for you. It's always trouble to print these exactly perfect parts due to printer calibration - even assuming my printer was accurate when I was designing. Try printing with a small amount of horizontal expansion, or similar setting in your tool, if you need a tighter fit.

The thing files includes the .123dx source made in 123D Design, if you're interested in remixing.

Jan 30, 2017 - Modified Jan 30, 2017
wkearney99 - in reply to rbnhd

wrong thing response, jeez, sorry.

+1 to you for including the source, remixing complex stuff is a lot easier with model source instead of just STLs.

I've got it loaded in 123D. I have zero experience with 123D, so it's a bit of an uphill climb.

Can I ask one question? How should I push up the ceiling of the knob cylinder? How did you make it? Is it possible to grab just that top circle and push it up a few mm?

The one thing I really dislike about 123d and Fusion 360 is they make it really hard to grab the right handles sometimes. All this turning around axis, moving workplanes, grrr.... I mean, I get it, manipulating 3-space in 2-d is never going to be easy but, still...

Nevermind, I managed to fight my way through the UI. Had to spin it around to get at the bottom, select just the top of that cylinder and use the tweak function, which lit up an up/down movement handle.

I've got a remix in the process:

I have another variation in mind, and will upload it later this week.

123d is annoying in that you can't easily manipulate the model directly. The way to make the hole deeper is to make a new cylinder and subtract it from the existing solid.

I usually use Open SCAD these days, made this thing as my first ever model :)

Worked like a charm! Stock control knob in the trash where it belongs! Thanks for sharing!