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[jotjotde]

A colleague printed the Thingiverse plug (as posted by@Pard) using light gray filament. So I covered it with black wrap. The two printed clips did not appear very sturdy to me, so I applied some silikon glue to the edges before putting it in. Dimensions of the plug were totally OK, so I am happy now and I can recommend this.

[Pard]

Awesome!  Appreciate the review.

[jotjotde]

Thanks @Pard for making us aware of this.
Added a pic to my former post for everyone's education 

[Pard]

That looks great!  What about the opening on the other side of the swingarm facing the wheel?  Debris gets in from that side as well.

[jotjotde]

@Pard, TBH I noticed that wheel-side opening the first time yesterday  and thought 'DAMN - work not done yet!'

What I also noticed is, that this part of the swingarm appears to be totally closed on the underside. I would have expected some opening to help collected water flowing out, because one can easily imagine that during rain the rear wheel will shovel gallons of water inside. But I cannot say bc am a sissy dry weather rider - it would be interesting if anyone confirm standing water inside the swing arm.

[Specter]

dry weather rider or not, you WILL sooner or later, get caught by a storm and enjoy rain that feels like hailstones 
Good points though, but even running thru a puddle on the road from someone's sprinkler etc can pull water up.

Aaron

[Demoni]

What I also noticed is, that this part of the swingarm appears to be totally closed on the underside. I would have expected some opening to help collected water flowing out.

There is a drain hole in the bottom of the swingarm for evacuating water.

[jotjotde]

Aaron, your ‚wish‘  came promptly true. On my commute home I ran into a strong rainshower.

After drying myself I looked what the bike was doing. In the swingarm was water standing! During cleaning the bike I also sponged the underside of the swingarm and suddenly there was water dripping! With a nail I opened the drain hole @Demoni just mentioned, apparently it was completely clogged. About a small glass full of muddy water ran out.

Judging from this the front hole plug does not very much for keeping the swingarm free of water and debris. Secondly, it‘s advisable to check from time to time if the drain hole is unclogged.

[Specter]

Anytime you get a drain hole ANYWHERE you MUST frequently check it for plugging.  Dirt and debris will clog them quickly.  Given they will tend to frequently be wet / damp, they act as dirt magnets and will collect dust to form mud and an eventual plug.

Bugs are a problem too.  We tripped a 500 MW generator one day because a mud dauber decided to build a nest in one of the legs of a furnace draft transmitter, (the open to the atmosphere one).  Small holes plug easily, bigger holes attract bugs looking to nest.  Check frequently and clean as needed.

Aaron

[jotjotde]

After the 'water incident'  I decided to cover up the wheel-side hole in the swing arm as well.

Off-topic: If anyone askes themself, why these holes are in the swing arm, the answer is: probably because it's a casted part. Designing casts is quite tricky and even more so for intricate parts.

The hole itself is 60 x 80 mm with radii of 30 mm. So is designed a cover with 5 mm overlap and 5 mm thick for 3D printing. The bottom part is made with reduced thickness to create a narrow opening against the body to allow for aeration. I avoided clips or anything complicated and just fixed the cover with Sikaflex (silicone glue for outdoor conditions).
Admittedly the cover is totally flat and does not hug the curvature to 100 % but I did not want to make it more complicated than necessary - in the end it's hardly visible anyway and the gap is filled with silicone.

Let's see if that will work.

[Pard]

Beautiful job!

[jotjotde]

Thx @Pard for the praise 

As a conclusion to this, after another rainshower yesterday I can confirm that the cover appears to be working. No water inside the swingarm anymore.