Electronics and features
There is all kinds of technology to discover in the Plus4’s build chamber, starting with a clever mechanism for ejecting filament. Affectionately known in the community as a poop shute. To the right of this is a recess for a bag of activated carbon to filter the exhaust air. However, this must first be removed from its bag, otherwise you won’t get very far.
What I find interesting here is the combination of ejection, rubber pad for cleaning the nozzle and then another slightly inclined piece of PEI, which is also spring-loaded. If the extruder moves to this position from left to right, the nozzle is effectively cleaned of the last remaining filament and then “clogged” in a controlled manner.
A camera is also installed in the corner ex works. Don’t forget to remove the small protective film from the lens!
Here is a preview of how this camera will be displayed in Fluidd’s web interface.
The print head is once again somewhat larger and has been fully encased.
Removing the cover is a little fiddly, it is held in place partly with plastic parts and partly with magnets.
And here’s a look at the Plus4’s direct drive system and bed sensor. The design of the hotend is somewhat reminiscent of the Bambu Lab printers.
Thanks to the toolhead PCB on the back, only one cable needs to be laid to the print head, the rest is then distributed “locally”.
The entire technology is hidden behind a metal cover on the back.
Six screws later, this can be removed and the fan cable is thankfully long enough.
I would describe the cable management as “functional”. However, as there is nothing in this small chamber that could get in the way of the cables, this is fine.

The mainboard is again an MKSpi clone, designated X-7 V1.0 and equipped with 32GB eMMC memory. Interestingly, different stepper drivers are used. The high-quality TMC2240 drives the X and Y motors, TMC2209 the two Z stepper motors.
Incidentally, these are hidden on the underside together with the power supply unit.
A filament sensor has also been installed in front of the hotend. Interestingly, a second sensor determines the diameter directly at the filament inlet. Because the Klipper log repeatedly contains entries like this one:
// Filament dia (measured mm): 1.8899997803427793
With the incredibly large deviation from the actually expected thickness of 1.75mm, the measurement result does not appear to be particularly accurate. However, it is apparently only used for tangle detection.
It is therefore checked whether the filament is still moving as expected or is stuck somewhere. For example, because something does not fit when winding the filament roll.
19:26:46 // shaper_type_x:zv shaper_freq_x:50.200 damping_ratio_x:0.100000
19:26:07 // To avoid too much smoothing with 'zv', suggested max_accel <= 9800 mm/sec^2
19:26:46 // shaper_type_y:zv shaper_freq_y:37.400 damping_ratio_y:0.100000
19:26:29 // To avoid too much smoothing with 'zv', suggested max_accel <= 5400 mm/sec^2
An acceleration sensor is also on board so that the appropriate resonance compensation and maximum acceleration values can be determined for your specimen. Here is the shortened output in the console.
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