Despite several attempts with different adjustments, the results haven’t met my expectations. Specifically, one end of the string frequently detaches from the wall during printing, causing a messy outcome.
Here’s what I’ve tried so far:
Nozzle Size: I’m using a 0.4mm nozzle.
Filament Drying: I ensured the filaments are dry.
Flow Rate and K-Factor Tuning: I adjusted the flow rate and k-factor for the filament.
Arachne Wall Generator: I enabled the Arachne wall generator in the slicer.
Disabling “Wipe While Retracting”: Following the author’s suggestion, I disabled this.
Maximizing Parts Fan: Increasing the parts fan speed helped slightly.
Nozzle Temperature: I raised the nozzle temperature (to 230°C for PLA and 270°C for PETG), which improved the situation.
Layer Height: I experimented with a 0.28mm layer height (the original model recommends 0.3mm for a 0.4mm nozzle), but the impact was minimal.
Print Speed and Silent Mode: I slowed down the print (wall speed and acceleration) and ran it in silent mode, but the issue persisted.
Given these efforts, what additional adjustments should I consider to improve the bridging quality?
I printed the same model, and it worked perfectly.
If my memory is correct, you must follow the 3dprintbunny settings recommendation.
The 0.3mm is mandatory, and the classic wall generator with the Detect Thin Wall setting should be used instead of Arachne.
Yeah. The model’s “strings” are actually structures that are sized so the slicer will be “satisfied” the string can be printed as a single extrusion, so it will slice them that way. If you change slicer settings, the slices’ geometry doesn’t line up with the string’s geometry and you get strings that can’t be printed correctly because they need two passes, or maybe less than one pass.
The default P1S printer config has the max layer height set to 0.28mm on 0.4mm nozzle. Do you need to change the printer config in order to set the layer height to 0.3mm?
I printed the model at actual size initially, but I might have overlooked some other settings, resulting in unsatisfactory result.
The results I posted were after adjusting the X and Y dimensions while keeping Z unchanged. Initially, I believed that this type of resizing wouldn’t impact the string connections, perhaps I was wrong.
XY scaling will confuse the slicer. You’re making the strings bigger than a single extrusion and the slicer will try and compensate, messing up the sliced model.
I finally able to reprint and get a good result using exact the config below:
Change the layer height to 0.3mm to align the model design. This needs to change the default printer max layer height from 0.28mm to 0.3mm
Use “Detect Thin Wall” and don’t use “Arachne” wall generator.
Keep the model dimension unchanged. The parameters are fine-tuned exactly to the model.
Disable “Wipe while retracting”.
Use “Bambu Studio”, and don’t use “Orca Slicer” for this model. Interestingly, the G-Code produced by Orca Slicer seems to result in weaker joints for the bridges. The exact reason isn’t clear yet, and I can see it produce more segments for the bridges, may cause problems for print.
Previous I mentioned higher temperature would help. The extra stringing at higher temperature might contribute to stronger bridge connections, but this is not the right fix.
These screenshot shows different the printing path on different parameters.
This has been helpful to read as I’m trying to fix my settings for a recently failed string art print. I’m having trouble recreating your first “Good” example where the string goes over and into the wall as opposed to just started on the inside of the wall (currently it’s looking like your “bad 2” example).
Order of walls: inner/outer (changing this didn’t seem to work)
Thick bridges: enabled
I’m thinking it may just be that my walls are thin and I won’t be able to get it so that the string goes through the wall to the outer edge. Also worth noting that it’s two outer walls and one gap infill in the middle that makes up the wall, just like your bad 2 example.
