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This retractable razor blade scraper is an improvement over one I used to have for scraping burnt gunk off a ceramic stove top. Features:

No removable cap to get lost. Snaps into three positions: load/unload, safe storage, blade exposed.
Sliding the top half all the way back exposes the blade for use.
The middle position retracts the blade under the top half. In this position the hole on the handle end aligns in each half so the tool can be stored by hanging on a nail or peg.
Sliding the top half all the way forward allows the two halves to separate, for changing the blade.
Fits a standard double-edge shaving safety blade.

I have one in my kitchen for my stove top, and one in my car for scraping tree sap off my car windshield. You can use it to remove prints from a glass print bed too -- I don't need it for my Prusa printer because it uses a flexible steel sheet that pops off the prints.

There are two versions:

bladescraper_original.stl is the original design that existed since 2021
bladescraper_moreblade.stl extends the blade out an additional 1 mm, the handle body is thinner, and the front edge has a shallower overhang, to allow for shallower scraping angle.

Print settings

Printer Brand: Prusa MK3S

Supports: No

Resolution: 0.2 mm layers, 0.4 mm nozzle

Infill: 20% gyroid

Filament: Generic PLA

Notes:

Print settings for PrusaSlicer / Slic3r:

Perimeters = 3
Detect bridging permimeters = true
Top fill pattern = Rectilinear
Fill angle = 90 (this should fill along length of top surface)
Bridging angle = 180 (needed to correct bridge direction in grips)
Advanced / Elephant foot compensation = 0

Post-printing

It is a good idea to test the movement before installing a blade.

Sand or file off any burrs left on the top layer of each part, or else the parts won't slide. Sliding operation may be rough at first, but smooths out with use.

You may also want to put a tiny bit of lubricant on the two mating surfaces and the snap mechanism. Rubbing a candle or crayon on the surfaces works pretty well as a dry lubricant.

Category: Hand Tools

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