FLSUN S1 Pro Improvement Collection: Unload macro, transport wheels

G-unload macro: reliably unload filament by retraction

I borrowed the idea from my Sovol SV08 and adapted the macro for the S1 Pro. It starts by heating the nozzle to 235°C—good for most filaments, though you might want to go a bit higher for ABS or ASA, but it doesn’t need to be the actual printing temperature. Then it extrudes a little to form a clean tip. And here’s the key part: it then retracts a short distance quickly to move the molten filament into the cold zone, then pauses for a few seconds to let the tip solidify slightly. This prevents stretching or deformation during the next step: a slower retraction to fully remove the filament. As this is happening it’s a good idea to hold onto the filament at the spool and pull gently during this final retraction phase. Once it’s complete, the macro cools the nozzle.

Unfortunately, I haven’t yet figured out how to activate this macro from the on-screen unload button—it might require a software update. For now, you can run it from the Mainsail interface on your phone’s web browser.

I show the whole operation on my YouTube Channel: gerGO PRINT 3D

To install:

1. extract the file gp3d_macros.cfg from the zip file
2. copy it onto the printer by dragging the file over the web browser showing the Machine page of Mainsail.
3. add the following line to printer.cfg: [include gp3d_macros.cfg] below the other include line(s).
4. save and restart

To use:

1. start the macro "GUNLOAD" from the Macro section of the Dashboard
2. wait for it to heat the nozzle, extract, quick retract and PAUSE
3. after the 3 seconds pause, make sure to also gently pull on th e filament as the slow retraction starts.
4. the after the retraction the macro will start cooling the nozzle

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Transport wheel adapters

These are an improvement on alebanci's free design on Printables, making it sturdier and free while requiring no glueing. Get three furniture transport wheels from AliExpress for a few cents. This adapter fits on the foot of the FLSUN S1 and S1 Pro and the poligonal shaped turning part on the transport wheel.

The new collars snap onto the turning top part of the wheels and then into the feet adapters. To install them, first slide the adapters onto the printer's feet by slightly tilting the machine. Then snap the wheels into place with the collars.

Both are a snug fit, requiring no fastening, the weight of the device holds them together, and you can easily remove the rollers when no longer needed.

The original rubber feet still reduce vibrations, and the rollers don’t compromise the printer’s stability. I was initially concerned about their effect on input shaping, but after recalibrating, the input shaper frequencies actually improved, which might even enhance the printer’s speed—a surprising bonus!

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UPDATE:

Added my Orca Slicer presets for the S1 Pro, if you decide to ditch FLSUN Slicer. Includes correct Max Volumetric flow values, exclude object options and the filament change g-code. Please see my video demonstrating them: https://youtu.be/KhTX2cq_UHM. Extract "FLSUN S1Pro 0.4mm nozzle.zip" and import into Orca Slicer. Based on the stock S1 presets and new FLSUN settings.

I show both in practice on my YouTube Channel: gerGO PRINT 3D

Transport wheel adapters

Print 3 of both components, oriented flat side down. No s, no brims necessary, you can add mouse ear brims on the adapter with sharp corners to avoid lifting from the bed. I printed them out of PETG, but PLA or any other (inflexible) material should work as well.

GUNLOAD macro

To install:

1. Open Mainsail web interface by entering your printer's ip address into the address bar of your web browser running on a computer in the same home network (subnet). Go to the Machine page (showing a list of files).
2. Extract the file gp3d_macros.cfg from the zip file
3. Copy it onto the printer by dragging the file over the web browser showing the Machine page.
4. Open printer.cfg, and add the following: [include gp3d_macros.cfg] below the other include line(s). (See screenshot showing the way printer.cfg shoudl look after the change)
5. Click "save and restart"

To use:

1. start the macro "GUNLOAD" from the Macro section of the Dashboard
2. wait for it to heat the nozzle, extract, quick retract and PAUSE
3. after the 3 seconds pause, make sure to also gently pull on th e filament as the slow retraction starts.
4. the after the retraction the macro will start cooling the nozzle