Hi Fox! I'm actively investigating the problem. When your players are kicked from the server, please have them give you their own log, located at %appdata%/Roaming/Space Engineers/spaceengineers.log

Heres a couple of log files I could grab:
https://drive.google.com/open?id=1WaiJEagq4WsNSemNP4a3-dX27A0KSSFY

Hmm neither of those logs show any stacktraces or even show the event where the user is kicked. They do show some issues with Automatic LCDs 2 and XPAR not loading correctly and throwing errors, but I don't think that would have anything to do with it. I see nothing that would affect Nanite Factory at all, nor are there any nantie factory related errors serverside or clientside ... there's going to be a hotfix later that might address some problems.

Ok, thanks for your help

Right, so the recent update to the mod hasn't fixed the issue. However I believe I have located the error within my server log files that the console doesn't show. The following error prints just before people are getting kicked:

2019-01-08 01:06:42.931 - Thread: 1 -> No definition 'MyObjectBuilder_ShipWelder/(null)'. Maybe a mistake in XML?
2019-01-08 01:06:42.932 - Thread: 1 -> Exception occured: System.NullReferenceException: Object reference not set to an instance of an object.
at Sandbox.Game.Entities.MyCubeGrid.BuildBlocksRequest(UInt32 colorMaskHsv, HashSet`1 locations, Int64 builderEntityId, Boolean instantBuild, Int64 ownerId)
at VRage.Network.CallSite`7.Invoke(BitStream stream, Object obj, Boolean validate)
at VRage.Network.MyReplicationLayer.Invoke(CallSite callSite, BitStream stream, Object obj, EndpointId source, MyClientStateBase clientState, Boolean validate)
at VRage.Network.MyReplicationServer.OnEvent(MyPacketDataBitStreamBase data, CallSite site, Object obj, IMyNetObject sendAs, Nullable`1 position, EndpointId source)
at VRage.Network.MyReplicationLayer.OnEvent(MyPacketDataBitStreamBase data, NetworkId networkId, NetworkId blockedNetId, UInt32 eventId, EndpointId sender, Nullable`1 position)
at VRage.Network.MyReplicationLayer.ProcessEvent(MyPacketDataBitStreamBase data, EndpointId sender)
at VRage.Network.MyReplicationLayer.OnEvent(MyPacket packet)
at Sandbox.Engine.Multiplayer.MyTransportLayer.ProcessMessage(MyPacket p)
at Sandbox.Engine.Multiplayer.MyTransportLayer.HandleMessage(MyPacket p)
at Sandbox.Engine.Networking.MyReceiveQueue.Process(NetworkMessageDelegate handler)
2019-01-08 01:06:42.932 - Thread: 1 -> Packet processing error, disconnecting 76561197964484914
2019-01-08 01:06:42.938 - Thread: 1 -> User left FatLabMan

Tested on Build 3 just to be sure and the server still kicks me with the same error in the server log.

Hi again Fox. YES that would definitely be the cause of the issue and should not happen. MyObjectBuilder_ShipWelder is a base vanilla object, so I'm guessing this problem comes down to a mod conflict or something else. Maybe take a look at some of the other mods I mentioned that are also throwing definition errors, or check out any of your other mods that have anything to do with ShipWelders, which is what a nanite factory block is.

Ok, I've fixed the issue. I probably should have noticed this sooner but the entire mod folder in the server directory was empty. Server console shows the mod downloading successfully but none of the files were actually there.
Fixed by just manually putting the files onto the server, I'm not sure if this is an issue with my server host, the steam workshop, or if its something you can resolve but regardless it's fixed for now.
Thanks for your help.

If you have FTP access to the mod folder, try setting CHMOD on that folder to 777 (read/write/view for all), it kinda sounds like your server doesn't have write access to the folder.

You put a bandaid on it for now but the server still won't be able to update those mods like it should.

Read and write permissions are all fine, I'll just have to remember to manually add the files each update

The Ore Detector scans for let's say gold...it says X ammount found. Then the Nanite Factory mines well over 3x that ammount. Is this normal ? We are talking about the veins on a planet. Thank you.

is it?

It should not be doing that, unless it has something to do with inventory sizes multiplier.

I've got an Ore bug as well. At some times my nanite ore detector doesn't display filter options, other times it does not display all of the vanilla ore options. Please note that I have several modded ore types. Is it due to a limit on the number of display-able filters in the Nanite ore detector?

@nukegard...no, I like to live dangerously and use 1x Inv. Well, it's a bug that I can live with :) About the ore bug, when I add at least 1 of each upgrade it work like a charm. Will try it on a new save with nothing but the Nanite Factory and see.