Week 5 3D Scanning and Printing

This page documents the group assignment for week 05 of Högni, Jóhannes and Ólöf.

• Test the design rules for your 3D printer(s)
• Document your work on the group work page and reflect on your individual page what you learned about characteristics of your printer(s)

Overview and Approach

We have access to different 3D printers and are going to present the outcome of various test prints and the derived design rules.

We compare FDM printers from different brands using PLA and PETG.

One test piece is this "All in 1 Test with Benchy" by @benchy1 from here.

We also found this smimilar, but larger and more complex test piece by @majda107 from here.

And last but not least we wanted to make a clearance test for joints, so Jóhannes made two test files for that. Both test the clearance of joints with a horizontal and vertical rotational axis with different clearance.

• 0,1 mm : 0,15 mm : 0,2 mm
• 0,1 mm : 0,2 mm : 0,3 mm

Here is the folder in the repository containing all four files.

Bambu Lab X1 Carbon

Test 1

Print settings - Test 1

Bambu Studio slicer; 0,4 mm nozzle; 0,2mm layer height; 50% infill

We printed our tests in PLA. This first test was very good! No strings on the bridges and the Benchy boat looked nice. The only thing that was not ok was the 80° overhang because under it there were a lot of strings. But overall, very well printed.

Test 2

Print settings - Test 2

Bambu Studio slicer; 0,4 mm nozzle; 0,2mm layer height; 50% infill

The second test was bigger and more complicated. It also came out very well. There were threads under the 80° overhang that was similar to the overhang in test nr. 1. But in the smaller overhang, which was steeper, there were threads under 75°.

Joints test

Print settings - Joints test

Bambu Studio slicer; 0,4 mm nozzle; 0,2mm layer height; 50% infill

The joint tests came out similar. Both the horizontal and vertical joints were moveable at 0,15. We printed two pieces of each and the lower image show how the joints broke.

Prusa MK4S

Print settings

Prusa Slicer; 0,4 mm nozzle; 0,2 mm layer height; 20% infill; general perimeter speed 80 mm/s

First we printed this small test piece in PETG.

That appeared to be very successful. Even the overhang in 80° was suprisingly well printed. All the small towers and details printed very well and the bridging was okay as well, even though you could see some loose strings on the downside of the 20 mm and 25 mm bridge.

Then we also printed the joint test in PETG.

Here the results shows that the vertical joint broke loose at 0,2 mm clearance and the horizontal joint at 0,15 mm.

We repeated the tests for PLA and here are the parts.

Ultimaker 3 ?

Comparison and Design Rules

Here is a comparison for the All in 1 Test for PLA.

	Bambu	Prusa	Ultimaker
Speed [mm/s]		80
Layer Height [mm]	0,2	0,2
Printing time [hh:mm]	00:51	01:03
Overhang flawless	50°	60°
Overhang acceptable	70°	70°
Bridge flawless [mm]	25	10
Bridge acceptable [mm]	25	15
2mm tower	Very good	very good
Total length deviation [mm]	- 0,26	- 0,2
Benchy	flawless	flawless

Here is a comparison for the All in 1 Test for PETG.

	Bambu	Prusa	Ultimaker
Speed [mm/s]	x	80
Layer Height [mm]	x	0,2
Printing time [hh:mm]	x	01:16
Overhang flawless	x	50°
Overhang acceptable	x	70°
Bridge flawless [mm]	x	10
Bridge acceptable [mm]	x	15
2mm tower	x	very good
Total length deviation [mm]	x	- 0,3
Benchy	x	flawless

Here is a comparison for the joint test in PLA and PETG

	Bambu	Prusa	Ultimaker
PLA horizontal	0,15	0,15
PLA vertical	0,15	0,2
PETG horizontal	x	0,15
PETG vertical	x	0,2