All Purpose Razor Blade Scraper (REV2)

This tool securely holds replaceable plastic and metal scraper blades.  In addition to cleaning plastic or resin from 3D print beds, it can remove tape, stickers, dried residue, flaky paint or coatings, gaskets, …  It is also great at scraping algae off aquarium glass.  

Revision 2

I updated the design to use metric and imperial fasteners, and there is now one screw size for each variant.  All of the parts have changed slightly.  

Which Version?

There are several versions of the scraper to fit your specific needs.  The standard version leaves 6 mm of the blade exposed, and the extended blade version leaves 9 mm (half) of the blade exposed.  

The ergonomic handle version is the nicest to use, but requires supports.  The simple handle (in the zip files) has a rod-shaped handle that comes in multiple lengths labeled by overall length, and prints without supports.  The 125mm handle fits on a 120x120mm bed, the 220mm handle fits on a 180x180mm bed, and the 300mm handle fits on a 250x250mm bed.

The full set of models (stl, step, and 3mf for each size and fastener type) are in the zip files.

Supplies

You will need a standard size, rectangular blade in either plastic or metal.

• 40 mm x 18 mm x 1.2 mm

For the metric parts:

• M3x8mm screw

  • button head recommended for a low profile

• M3 square nut, or M3 hex nut

For the imperial parts:

• #4-40x3/8in screw

  • pan head or machine screw recommended for a low profile

• #4-40 hex nut

Instead of using a tool-less friction fit, I made a design that actively clamps the blade into place.  As long as you have a matching blade size and reasonable printing tolerances, it should not come loose.  If the blade is too loose and not clamped securely, try adding tape to build up extra thickness.

Hanger

There is a magnetic hanger for the ergonomic handle models.  I made it to keep my scraper in a handy location on my tool cabinet.  Glue the two magnets into place.    

• (2) 6 mm x 3 mm magnets

Fuzzy Skin Grips

You can use the 3mf files to add custom grips with fuzzy skin!  Here are directions for PrusaSlicer:

1. Open the 3mf file and select Yes to load it as a single object with multiple parts.

2. Right click on the Fuzzy Skin Right/Left part in the side bar, select Change type, and select Modifier.

3. Right click again on Fuzzy Skin Right/Left in the side bar and select Add settings.  Then select Fuzzy Skin and enable each setting.  I used 0.3 mm for point distance and thickness for a fine texture.

Supports

You need to add supports when printing the ergonomic handle!  The 3D model comes pre-oriented to minimize the amount of supports needed, and only overhangs less than 45 degrees need support.  I recommend using the smallest Top contact Z distance that you can along with Snug supports for the best looking, flattest surface.

Safety

Please use common sense to avoid cutting yourself or other people.  You will also need to consider the strength of a 3D print to avoid breaking the handle.

Thanks for visiting, and enjoy!

Minor update: Added magnetic hanger for ergonomic handle.  

Major update: Added models for imperial fasteners.  

Major update: Added models for M3 hex nuts.