LUBA 2: wheels getting stuck in tall grass and weeds near edges

What happened

An owner running a LUBA 2 (3000X) on terrain with gravel, bushes, and a trampoline reported two recurring, near-daily problems over several months¹:

1. Mowing stops under/near a trampoline and other tight-clearance obstacles. A tight no-go zone around a trampoline's edge (drawn small to avoid leaving uncut grass) repeatedly caused the mower to get physically stuck trying to work around low branches or the trampoline's edge. The robot's own attempts to dig itself free tore up grass in the process.
2. Tall grass and weeds near a narrow corridor (a path running along a fence) wrapped around a rear wheel. Weeds that leaned or hung over the cutting edge would sometimes get pulled under and cut normally, but stronger/taller weeds would catch the wheel itself, wind around the axle, and lock it — requiring the owner to free it by hand.

DIY fix: a 3D-printed wheel guard

The owner's fix for the wheel-wrapping problem was a small 3D-printed guard/spoiler mounted over each rear wheel's spring assembly, held on with a single screw per side. It sits close enough to the wheel to stop tall grass and weeds from reaching around and wrapping the axle, without blocking the bumper or interfering with normal operation. After installing it, the owner reported no further wheel-wrapping incidents¹. No design file, printable model, or part source is given in the source — this documents that the approach worked for one owner, not a sourceable part.

Workarounds that don't require printing anything

• Widen no-go zones around trampolines, low branches, and similar tight obstacles. The owner found that a no-go zone drawn too tight to minimize uncut grass was the direct cause of repeated stalls; widening it (accepting a bit more uncut grass at the edge) stopped the mower from repeatedly trying to squeeze through and getting stuck.
• Keep a working path 5–10cm clear of fences, rather than running flush against them. Running the mower's path directly against a wire fence caused it to repeatedly catch and do half-circle stuck maneuvers. Offsetting the path by 5–10cm from the fence line left some uncut weeds directly at the fence but stopped the snagging behavior.
• Turn off "smart view"/smart obstacle detection for zones under trampolines or low hedges, if the mower is staying further back from an edge than needed and leaving a strip uncut. The owner notes this is a per-zone tradeoff, not something to disable mower-wide.
• Press the grass button twice to lower the cutting deck as far as it goes before washing underneath — makes it easier to clean out packed grass/mud from under the mower. The owner cautions against using a pressure washer; a garden hose is sufficient and is what Mammotion's own guidance recommends avoiding high pressure for.

Also confirmed in this report: coverage area is software-limited, not hardware-limited

The owner separately confirmed — and this matches what Mammotion states, documented here because it came up directly in troubleshooting context — that LUBA 2 models rated for 3,000/5,000/10,000 m² all share identical hardware (same battery, same motors), with the rated coverage purely a software limit. Any rated model can map roughly 20% beyond its stated area in practice (e.g., a 3,000 m² model mapping up to ~3,600 m²) without a reported hardware problem.