Both FP3 versions should have the exact same measurements, as they are basically the same phone with some internal changes.
But the growing case is a well known issue:
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As mentioned the FP3 and FP3+ are the same, just some internal module differences.
I have the same gap and the double sided tape works fine and is easy to replace should I want to remove the case.
The tape I use is very thin, like sellotape. I do also have thick double sided nearly 2mm thick. I’ll try that come to think of it.
The reason the thin tape works is that the top and the bottom are rubbery and flex easily to the tape and the tape adhesive is strong enough to hold both.
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Do you mean the bumper that was supplied with the FP3 but not the FP3+
This guide shows it is for the FP3, bottom left of the first pair of images. Maybe you have an FP3+ or just didn’t get the bumper which was included by default with the FP3. The bumper is not available otherwise than second hand or custom made.
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What you call the bumper is what I meant by ‘bevel’ in a previous reply. Yes I have the FP3+, so I supposed this must have been an extra component of the original FP3. Which is why I assumed that the issue of the oversized case must be more severe with the FP3+, as not having the bumper must surely remove a millimetre or two from the overall dimensions.
But having said I have a FP3+, I’d been thinking recently… I bought it secondhand, it has the non-translucent back cover and no ‘bumper’, so all seems normal, but it shows up in the default device name, model name and anywhere else - like on my PC - as a FP3. If somebody took an FP3 and simply snapped on the back cover of the FP3+, what can you check to be absolutely sure of which model you have? Any indication in the serial number? I’m assuming that I have the upgraded camera modules, but in Open Camera the maximum size I can choose is 12MP. What also got me thinking about this is that when testing the front camera in a video call for the first time, it seemed to be crooked and out of line. I’d have to hold it at an awkward angle to show directly ahead of the phone. And so could somebody have changed the front camera module and not seated it properly?
Yes the model is the FP3 version is FP3+
Follow this path
Settings > About phone > Model > Hardware version
The camera can only output 12MPx as the sensor is 4x12.
All the best
Under About Phone > Model, I only have two items greyed out.
Model
FP3
Serial number
xxxxxxxxxxx
There is no subcategory ‘Hardware version’. Maybe this is something that is changed by iodéOS?
Click on Model
Settings > About phone > Model > Hardware version 
I can’t. It doesn’t exist. The two items I showed above are greyed out, you can’t click them to delve any further.
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That doesn’t work either. When I put the very last asterisk, the whole dialling string suddenly disappears and so I cannot actually dial anything. Up until the penultimate character (the hash) the string remains visible.
This only works with stock OS and you are on Iode as you mentioned…
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Sorry I didn’t get that you were using iodéOS
I suspect that since iodé supply a single OS image for both FP3 and FP3+, they simply set the phone model as FP3 and don’t have (or don’t use) any tool to differentiate between the two, at least as far as naming is concerned. It would just be nice to have some way to verify and be absolutely sure.
If you didn’t get a bumper and you have an opaque back cover and white rims around both cameras then it’s more that just likely you have an FP3+
So you bought it with the deafult OS and installed iodeOS?
Yes. Ten seconds with stock Android made me feel so depressed I seriously contemplated abandoning and reselling my Fairphone straight away and sticking with my half-broken, ten-year-old Nokia.
Whilst iodéOS/Lineage/eOS might still be Android, the freedom from the creepy eyes of Google (and anybody else) matters enormously to me. I think I’ll still be interested in switching to a Linux phone with Plasma Mobile one day, when it’s truly ready to be a daily driver.
To return to where this topic started, if any manufacturer could produce an open phone much smaller-sized, not a giant unwieldy brick, and with a wrist strap attached, I’m there!
I don’t subscribe to Google, Amazon, Ebay, Facebook etc. etc.
So I started the phone without a google account, likewise my Win 10 withou a Microsoft account. The used adb to remove as may google apps as I could.
There is so much tracking that it cannot be avoided, maybe with the VPN option exceptions. But actively subscribing is not something I want.
I’ve nothing to hide from trackers nor Google but I don’t want to feed the monsters and just have a simple phone experience. The de-googled default OS doesn’t bother me.
Smaller with a wrist strap ? sadly the FP4 is even bigger and heavier 
No, the FP3 and the FP3+ have different Sizes. Cant remember witch one is bigger, not much, but there is a difference, in wide and high. Some Month ago i could compare them.
That cant be true or how would the display module fit on both?
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They are definelty the same size, but the FP3 does come with a bumper
https://shop.fairphone.com/en/fairphone-3-plus
The differences are the camera modules and the core module, with the only outer dif being the back cover and bumper presence.
FP3 without bumper
Length 158 mm
Width 71.8 mm
Thickness 9.89 mm
Weight: 189g
FP3+ No bumper
Length 158 mm
Width 71.8 mm
Thickness 9.89 mm
Weight: 189g
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