Prusa3D Forum - Recent Topics

Why so difficult to push filament through side sensor?

Malvineous — Wed, 29 Apr 2026 02:41:02 +0000

I'm not sure if I've done something wrong, but ever since I assembled my Core One+, it has been very difficult to push filament through the side sensor. It feels like something is blocking the path and I can hear a click each time I try to jam the filament in but it stops, as if it's pressing into something that moves and is blocking its path.

I moved the switch that is supposed to make it easier to push filament through, but it makes no difference. (There does appear to be less resistance after I have pushed the filament through, but it does not make it any easier to get the filament to pass through initially.)

Cutting the filament to a sharp point sometimes helps, but not always. Rotating the filament as I'm pushing it through sometimes helps. Wiggling the base of the PTFE tube as it enters the sensor sometimes helps.

It just seems to me like there's something misaligned inside that prevents the filament from being pushed through, no matter how hard you press (enough to bend the filament and put a crease in it, and it still won't go through).

Is this normal, or is it a sign that I have not quite assembled the side filament sensor properly?

Less Grid Boxes on the Bed on Mini Prusa vs MK4 in Prusa Slicer 2.9.4

eager — Tue, 28 Apr 2026 20:36:19 +0000

I've used the MK4 and there are many grid boxes within the 12 larger boxes on the bed viewing in the Prusa Slicer 2.9.4

There's only 16 large boxes in the viewer in that same Prusa Slicer 2.9.4

Are you only given those 16 larger squares when the mini-Prusa is the chosen printer?

reddit and Googled results suggest making all the sorts of settings changes but before I do that maybe it's just a matter that the mini-Prusa has such a small bed all the other squares within those 16 boxes are not needed for the mini-Prusa?

Thank you for your insights and help.

Axis test

Martha Rykala — Tue, 28 Apr 2026 15:43:05 +0000

On my initial test of mk3.5S after updating the printer, i am failing my X,Y axis test. I do not see any interference in the full travel of either axis, what can be the problem. I also noticed that during my Z axis test, the print head did not go all the way to the print plate. After topping out, the print head would only travel down about 65% of the distance towards the print bed or stopping with about 35% remaining travel. I am not sure what this means as it did pass the Z axis test.

Printer is asking for unloading and changing filament randomly during printing

Ulf — Tue, 28 Apr 2026 13:53:10 +0000

Hi, since yesterday my MK3S+ is randomly stopping, goes to the front left and asks to press the button to unload the filament like a filament /color change was triggered, although there is nothing in the gcode. I checked the sensor readout but this seems to be normal, also rebooting the printer didn't solve the issue. Anybody an idea what could cause /trigger this behavior?

Prusa goes Subscription

Jürgen — Tue, 28 Apr 2026 13:48:17 +0000

Who would have thought... Last year I cancelled my order for a Bambu printer when they announced the new lock-down mechanism in their firmware, restricting access to the printer from 3rd party tools. I thought I saw the writing on the wall that this was just the first step to making some services and functionality billable via a subscription model.

And now Prusa, of all companies, is the first consumer 3D printing vendor to offer subscriptions if you want more storage space or better video streaming?? https://subscription.prusa3d.com/

This sounds like a great way to generate rather limited income but alienate a lot of longstanding users. How does this align with your "you buy it, you own it, no strings attached" marketing message? Yes, I get it, users still own their printers and basic functionality remains free (for now). But can we talk about "mixed messages" for a moment?