Inside Corner Trowel

When money is hard to come by and other tools take priority, a tool that makes a corner at a 90 degree angle is usually not high on the list of equipment to buy. I wanted to make a relatively cheap tool that can do this. Normally a tool like this can go from anywhere between $10-20 but since it has a relatively small window of use, it is not often purchased. This project was designed for people that cannot afford a more expensive version of this tool as printing this in PLA is approx. $2.00

Bill of Materials

1. Total two parts made in OpenSCAD. Total ~150 grams of filament
   1. Cornering Tool
   2. Handle
2. All files posted at: | Youmagine Link

Tools needed

1. MOST Delta RepRap or similar RepRap 3-D printer

Skills and knowledge needed

• None, just connect the two pieces together as shown in the picture.

Technical Specifications and Assembly Instructions

1. Printing Instructions:
   1. Print Speed: 60 mm/s
   2. Fill Density: 25%
   3. Layer Height:.15 mm
   4. Support Type: Touching build plate, ONLY FOR THE HANDLE
   5. Platform Adhesion Type: Glue stick
2. Print time: ~13 Hours, 8 hours for the main part, 5 for the handle
3. Assembly Instructions:
   1. Connect the two pieces as shown in the picture above.
   2. Assembly time: 1 minute

Common Problems and Solutions

• Be careful removing the main Cornering Tool piece from the glass bed. Use an exacto-knife and carefully remove to not break the glass.
• Be sure to use sufficient adhesive on the glass bed so that the main Cornering Tool piece does not have its edges bow upwards.

Cost savings

1. Total Material Amount: 200 grams
2. Estimated Cost: ~ $1.50 depending on filament price
3. Commercial Cost: $10-20 | Home Depot's Wall Cornering Tool
4. Total Savings: ~7.50

References

• I wanted to be able to provide a useful semi-luxury tool that is not 100% necessity for construction but is still used quite often to make the insides of buildings look visually appealing.
• DIY video showing how to mud and tape drywall corners