Retrofit Micrometer Endstop Target for Taz 4/5

A Mitutoyo 148-507 micrometer head will reportedly fit this one. I haven't personally tried it, but the person who tried it in my openbuilds Z axis mod (which uses identical micrometer support says that it will work fine)

1-21-2015 - Repaired file uploaded.

I added a Micrometer to my openbuilds Z axis retrofit, and a few people have asked for a variant that will fit the stock Taz 4 / 5. Ths is that variant. You can see the Openbuilds version in the picture above. This one is basically the same thing, but has the socket for the 10mm smooth rod for a stock Taz.

The issue with the stock bolt and spring endstop target is that it can move with repeated impacts and heat and cooling cycles. Every time the limit switch hits it, it releases pressure on the threads, which allows the spring to sometimes press the bolt upwards a tiny fraction of a mm. Eventually, after a few hundred impacts, the bolt moves up far enough to screw with your layer height.

By replacing it with a micrometer, you get an endstop target that will never move due to heat or impact, and allows repeatable layer height adjustments to the thousandth of an inch.

I used this Micrometer here: which seems to be a knock of Mitutoyo of some sort, but any micrometer with a 9.7mm diameter, 6mm tall mounting barrel, 14mm diameter retention ring and an at least 22mm long measuring shaft should work. A Mitutoyo 148-507 reportedly works but I have not tested it myself.

Print instructions

Unassociated tags: Taz 4, Taz 5

Category: 3D Printer Parts Summary

A Mitutoyo 148-507 micrometer head will reportedly fit this one. I haven't personally tried it, but the person who tried it in my openbuilds Z axis mod (which uses identical micrometer support says that it will work fine)

1-21-2015 - Repaired file uploaded.

I added a Micrometer to my openbuilds Z axis retrofit, and a few people have asked for a variant that will fit the stock Taz 4 / 5. Ths is that variant. You can see the Openbuilds version in the picture above. This one is basically the same thing, but has the socket for the 10mm smooth rod for a stock Taz.

The issue with the stock bolt and spring endstop target is that it can move with repeated impacts and heat and cooling cycles. Every time the limit switch hits it, it releases pressure on the threads, which allows the spring to sometimes press the bolt upwards a tiny fraction of a mm. Eventually, after a few hundred impacts, the bolt moves up far enough to screw with your layer height.

By replacing it with a micrometer, you get an endstop target that will never move due to heat or impact, and allows repeatable layer height adjustments to the thousandth of an inch.

I used this Micrometer here: which seems to be a knock of Mitutoyo of some sort, but any micrometer with a 9.7mm diameter, 6mm tall mounting barrel, 14mm diameter retention ring and an at least 22mm long measuring shaft should work. A Mitutoyo 148-507 reportedly works but I have not tested it myself.

Print Settings

Printer Brand: LulzBot

Printer: TAZ 5

Rafts: No

Supports: No

Resolution: 0.5mm nozzle

Infill: 85% or better

Notes:

ABS is reccommended

Post-Printing

Instructions

This print includes a built in Skirt and removable "mouse ears" to aid in bed adhesion. You will remove and discard those pieces at the end.

You will need 1 M3 heat set insert for the Smooth rod retention bolt socket. Insert that as normal. The micrometer should just screw into place, then bolt the whole unit up as normal to your TAZ.