FSR Mounts

by EclecticAngler, published

FSR Mounts by EclecticAngler Feb 11, 2016
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FSR Mounts by EclecticAngler is licensed under the Creative Commons - Attribution license.

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2383Views 522Downloads Found in 3D Printer Accessories


This is a simple, printable mounting system for FSR auto leveling (worse sensitive resistors). I've used these on Rostock Max, Kossel 250, Mini Kossel delta printers and also in a Taz 4 Cartesian printer. I highly recommend buying the FSR Kit from UltiBots - it comes with the JohnSL interface board, the wiring harnesses with preassembled connectors. They work perfectly with this mount.

UPDATE: I've added a second version that is designed for the Kossel 250 or similar printers. There are 2 mount parts, one is for a threaded insert, the other is plastic and can be threaded directly. This extra hole is for an M3 cap screw that fixes the Holddown part as shown in the attached photo.

Print Settings

Printer Brand:



Rostock MAX






.2mm layers, 4 perimeters




I print these in PLA but make sure your heated bed has insulation under it if you do. ABS makes good parts too.


Print 3 holders, 3 plungers and 1 of the JohnSL brackets. The TAZ bracket holds the board vertically, the other holds it flat - which is more suitable for delta printers like the Rostock Max.

It is critical that the plunger slides free - but without slop - in the mount. The plunger was designed with 3 points of contacts to make them easy to fit. First, clean out the pockets in the mounts to make sure they are smooth. Test the plunger. If it is too tight, lightly sand the surface of the 3 lobes with 400 or 600 grit paper and water. Rinse thoroughly so you don't introduce grit into the mechanism and test the fit often (after rinsing). Once the fit is perfect, keep the mount/plunger pair together.

I lubricate the plunger with a little Vaseline or white lithium grease - VERY little!

Printed mounts with FSRs inserted. Note that one of the silicon pads in the UltiBots kit goes on top of the FSR before the plunger.

Mounts attached to the Rostock Max base. You can also attach them to aluminum 15x15 or 20x20 extrusions.

The plunger is screwed to the bottom of the snowflake insulator on the Rostock.

This is the little holder for the JohnSL board

Holddown for the Kossel 250 version.

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20 hours ago - Modified 20 hours ago

On the Taz where did you place the sensors? In 2 corners and mid bed opposite them, or under points defined by a maximum equilateral triangle solution?

I am going to use a set on a Folgertech FT-5. So using 3 sensors I believe the easiest solution (mechanically, as bed screws are near these locations)would be:
0X 0Y
300X 150Y
0X 300Y

(However the solution is not optimal, since most 3-point leveling solutions work best with the largest possible equilateral triangle using axially non-collinear coordinates)

The the largest equilateral solution for 300 x 300 bed would be:
0X 0Y
300X 80.38475Y
80.37475X 300Y
Each side =310.5828541230249

Ps. It was great meeting you at MRRF2017, please send me a pm, I lost your contact info.

The 250 mount is huge when opened in Cura

You must have a scaling issue or imported in the wrong scale. About 500 folks have printed this and I've printed dozens myself. I don't know Cura so I can't help but most slicers do allow you to scale or change from metric to inches. I suspect you are loading the files in inches.

Feb 12, 2017 - Modified Feb 12, 2017
Quaddict - in reply to EclecticAngler

I'll have to look again. I can open the threaded insert version just fine.

  • Thanks for the file!

You might be right, I jus dowloaded it myself except it is too small in KISS. It apparently was saved in inches and needs to be scaled to mm. In KISS that can be done with the Inch->mm menu option.

On the rostock mounts, do you use the silicone pads? Would you mind sharing how you mounted the bottom piece to the printer base? Thanks!

Yes or neopreme washers - one above the FSR is all that's needed.

Mounts look nice. Your print quality is superb! Thanks for your support - Brad

Do you still use the same plunger for the 250 Mount set-up? Looking at the pictures posted, there doesn't seem to be much clearance between the 250 bed stands, and the heated bed.

Yes I do. I'm not sure I understand your comment though.

Ok, I took a look at the STL for the motor mount screw holes. They are much much wider than this FSR mount. It looks like the best bet is to mount the FSR mount to the base plate on the Rostock Mini.

Thanks. I don't know so probably not! What is the required spacing? I've not seen a mini, is there a photo of one available?

There are two models on Thingiverse that I am aware of, http://www.thingiverse.com/thing:318971 and http://www.thingiverse.com/thing:318685. I only ask as I am at work currently, planning on printing out a test copy once I get home.

Rostock Mini Pro by 3D Printer Czar
Rostock Mini Pro Minifab.net

Nicely done. Do you happen to know if the spacing on the side rails of the FSR mounts will match the spacing for the screws that attach the bed to the motor mounts on a Rostock Mini? I have been looking to clean up the installation of my sensors.

Don't forget that the FSRs have a sticky back. When everything is ready, peal off the protective plastic and stick the FSR in the pocket on the mount.